Understanding the Nuances of Thyroid Disorders Flashcards
The two primary thyroid hormones that the body depends upon to support pretty much each and every metabolic process within the body are BLANK and BLANK?
T4 (thyroxine) and T3 (triiodothyronine)
Where is T4 primarily made and then stored?
Within the colloid of the thyroid gland cell.
Once we have T4, it is then converted into its active form, T3.
Where does the conversion of T4 to T3 happen?
Primarily within the thyroid gland, the liver, the kidneys, as well as every other cell within the body on an as-needed basis.
T3 is considered “active” because ?
It is the form of thyroid hormone that is the most preferred and utilized across all body tissues.
Where is the Colloid?
The space that rests in between the follicular cells
Where do the follicular cells rest?
These cells rest on the outside of the thyroid gland
Where can you find the Parafollicular cells?
In between the cellular structure of the thyroid gland.
True or False: Thyroid hormones are necessary for pretty much every single metabolic process within the body.
True
Thyroid hormones play a role in increasing BLANK activity and energy BLANK within the body.
Cellular metabolic; production
Thyroid hormones aid in BLANK, which is important for things such as human growth and development, especially in primary development stages of life such as fetal development, adolescence, and pregnancy
Protein synthesis
Thryoid hormones are BLANK, and play a role in increasing our body temperature, such as with basal body temperature.
thermogenic
Why does basal body temperature rise post-ovulation?
Because progesterone promotes thyroid hormone production, which results in thermogenesis and a rise in BBT.
Thyroid hormones also support erythrocyte production, which do what?
Help with oxygen and nutrient delivery across the body.
Why is thyroid health important for digestive function?
They support the production of gastric secretions and facilitate gut motility. This is also why hypothyroidism often results in constipation.
Thryoid hormones play integral role in BLANK hormone production, which is necessary for facilitating ovulation and promoting healthy reproductive function.
steroid
Thyroid hormone promotes a healthy BLANK function and detoxification, which is important for what?
Liver; This important for helping to promote the metabolism and the detoxification of certain hormones like estrogen, as well as cholesterol within the body.
Thyroid hormone plays a role in influencing BLANK expression.
Gene
Thyroid rhomrones maintain our brain health, memory, and our ability to stay cognizant and focused by promoting brain BLANK.
neurogenesis
The growth and development of nervous tissue
What is TRH?
Thyrotropin-releasing hormone, which is released from the hypothalamus in the brain.
Where is TRH (thyrotropin-releasing hormone) released from?
From the hypothalamus in the brain.
After TRH is released from the hypothalamus in the brain, it is delivered to BLANK, which triggers what?
thyrotropin-releasing hormone
To the pituitary, triggering the production and release of TSH (thyroid-stimulating hormone), which is then delivered to the thyroid-stimulating hormone receptor (TSHr) site on the thyroid.
What is TSH?
Thyroid-stimulating hormone
What is TSHr? Where is it found?
Thryoid-stimulating hormone receptor; it is found on the follicular cells of the thyroid.
The response to TSH on the receptor is going to stimulate which three different actions within the thyroid?
TSH = thyroid-stimulating hormone, the receptor is found on the follicular cells
- Thyroglobulin (TG)
- Thyroid Peroxidase (TPO)
- and it is also going to stimulate iodide uptake.
Iodide does not equal iodine. Iodine is found in the foods we consume
When we consume foods with iodine in them, such as kelp, seaweed, and iodized salt, the iodine within those foods gets reduced into the component, BLANK, within the small intestine.
iodide
After we consume foods with iodine in them and the iodine in those foods gets reduced into the component iodide within the small intestine, it is then absored into the bloodstream as BLANK, not as BLANK.
Iodide, not iodine.
The body still needs iodine in the BLANK form, not the BLANK form, in order to produce thyroid hormone. So this means the body has to reconvert BLANK back into BLANK in order for it to be utilized.
iodine; iodide
Iodide back into iodine.
What is iodide oxidation?
The body then has to reconvert iodide back into iodine in order for it to be utilized
What is the first step of iodide oxidation?
When iodide reaches the thyroid.
First, it has to pass through the follicular cell membrane of the thyroid, which requires the support of the sodium-iodide symporter.
From there, it enters into the colloid of the cell, a process known as “iodide uptake”, which requires TSH stimulation on the TSH receptor.
What is iodide uptake?
When iodide reaches the thyroid, passing through the follicular cell membrane of the thyroid, and enters into the colloid of the cell, which requires TSH stimulation on the TSH receptor.
Once iodide is successfully in the colloid of the cell, this is where BLANK comes in.
TPO
Thyroid Peroxidase, an enzyme produced by the thyroid gland.
TPO works alongside BLANK, which is going to also be produced by the thyroid gland to help facilitate iodide oxidation.
hydrogen peroxide (H2O2)
Together, BLANK and BLANK break off electrons from the iodide, transforming iodide back into iodine.
TPO and H2O2
Once iodide oxidation is complete and we have usable iodine within the colloid of th thyroid cells, the next step is where BLANK and BLANK — also produced from TSH receptor stimulation — work together, with the help of iodine and tyrosine to produce MIT (Monoiodotyrosine) and DIT (Diiodotyrosine).
TPO and thyroglobulin
Thyroglobulin is BLANK dependent
Tyrosine
Tyrosine is an amino acid found in foods such as chicken, turkey, fish, peanuts, pumpkin seeds, sesame seeds, lima beans, avocados, banana, and dairy.
What is Tyrosine?
Tyrosine is an amino acid found in foods such as chicken, turkey, fish, peanuts, pumpkin seeds, sesame seeds, lima beans, avocados, banana, and dairy.
What role does TPO play in the process of converted iodide back into iodine?
To take the freshly converted iodine and place it on top of the tyrosine of the thyroglobulin. Depending on how many iodine molecules were placed on top of tyrosine, this leads to the production of MIT (Monoiodotyrosine) — one iodine molecule — or DIT (Diiodotyrosine) — two iodine molecules15.
Whta do MIT and DIT do when they work together?
To produce the end product of thyroid hormone.
With MIT, or Monoiodotyrosine, there is BLANK iodine molecule present.
One
Hence the term “mono” which equates to “one”
DIT, or Diiodotyrosine, contains BLANK iodine molecules.
Two
Hence the term “di” which equates to “two”.